First night flight by a solar plane (photos) Summary: A plane developed by Solar Impulse landed Thursday morning after a 26-hour flight that was entirely powered by solar energy. By Andy Smith | July 8, 2010 -- 05:15 GMT (22:15 PDT) Previous | Next Image 11 of 11 The Solar Impulse HB-SIA has a 64-meter wingspan. Topic: Telcos Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.